Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Washer structure – Including means for retaining washer to fastener
Patent
1990-12-03
1992-01-21
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Washer structure
Including means for retaining washer to fastener
411368, 411915, 52410, F16B 3300, F16B 4300
Patent
active
050824120
ABSTRACT:
A roofing washer useful with a fastener having a head and a shank, such as, for example, a roofing screw, and provided with an annular lip so as to restrain the head after the head has been driven past the annular lip is disclosed. As molded from a resilient, polymeric material, the roofing washer has a plurality of discrete cavities, which facilitate radial expansion of the annular lip, and a plurality of discrete ribs, which separate the discrete cavities. In one possible embodiment, each cavity has an inner, generally cylindrical wall, an outer, generally cylindrical wall, and two end walls, each defining a plane oriented at an acute angle relative to a radial plane. In a different embodiment, each cavity has two planar walls and a curved wall whereby the cavities have substantially triangular configurations.
REFERENCES:
patent: 4663910 (1987-05-01), Hasan
patent: 4712959 (1987-12-01), Hasan
patent: 4757661 (1988-07-01), Hasan
patent: 4799845 (1989-01-01), Hrysko
patent: 4884932 (1989-12-01), Meyer
patent: 4930959 (1990-06-01), Jagelid
Illinois Tool Works Inc.
Wilson Neill R.
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